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检索条件"机构=OBR Research Center of Distributed and Mobile Computing"

共 115 条记录，以下是61-70 订阅

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Analytical Modeling of the Link Delay Characteristics for IEEE 802.11 DCF Multi-Rate WLANs

Analytical Modeling of the Link Delay Characteristics for IE...

引用

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Tarun Joshi Anindo Mukherjee Dharma P Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

Performance evaluation of IEEE 802.11 DCF has been widely studied under the assumption of a single transmission rate by all competing nodes. In practice, however, stations typically use different transmission rates. This is done to match to the changing channel conditions. Stations with poor channel conditions typically employ lower transmit rates in comparison to stations with better channel conditions. Under such scenarios, the throughput of each station becomes independent of its own transmit rate; rather it gets bounded by the slowest transmitting peer. This has been popularly classified as the performance anomaly problem. This paper provides a simple yet accurate analytical framework to study the link delay characteristics of such multi-rate networks

关键词： Analytical models Delay Throughput Peer to peer computing Counting circuits Performance analysis Monitoring Space stations Collision avoidance mobile computing

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Secure and efficient authentication in Wireless Mesh Networks using merkle trees

Secure and efficient authentication in Wireless Mesh Network...

引用

Conference on Local Computer Networks (LCN)

作者： Lakshmi Santhanam Bin Xie Dharma P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

In the recent years, wireless mesh network (WMN) has evolved as a new paradigm for broadband wireless Internet access. The self-configurability, open wireless infrastructure, and different management styles of WMN make them vulnerable to malicious attackers. As a first step to secure WMNs, it is critical to incorporate an authentication mechanism for mesh clients. The existing proposals are primarily based on public key certificates, which incur considerable overhead in signature verification. We propose a network layer authentication mechanism called Merkle Tree based Mesh Authentication Protocol (MT-MAP) for WMNs. It incorporates inexpensive hash operations using Merkle tree to authenticate single/multihop mesh clients. We also show how the use of hash tree facilitates fast and periodic refresh of authentication certificates. Finally, we present a security analysis of MT-MAP against impersonation and replay attacks.

关键词： Authentication Security Servers Protocols IEEE 802.11 Standards Public key mobile communication

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SVM-based intrusion detection system for wireless ad hoc networks

SVM-based intrusion detection system for wireless ad hoc net...

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IEEE Conference on Vehicular Technology (VTC)

作者： Hongmei Deng Qing-An Zeng D.P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

Wireless ad hoc networks present more security problems than the conventional wired and wireless networks. Intrusion detection, as a complementary mechanism to the regular intrusion prevention approaches, is needed to secure the wireless ad hoc networks. In this paper we focus on the network layer security issues and propose a practical support vector machine (SVM) based intrusion detection system. The effectiveness of our proposed approach has been verified by extensive simulation results.

关键词： Intrusion detection Ad hoc networks mobile ad hoc networks Cryptography Authentication Communication system security Wireless networks Support vector machines Network topology Wireless application protocol

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Threshold and identity-based key management and authentication for wireless ad hoc networks

Threshold and identity-based key management and authenticati...

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International Conference on Information Technology: Coding and computing (ITCC)

作者： Hongmei Deng A. Mukherjee D.P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

As various applications of wireless ad hoc network have been proposed, security has become one of the big research challenges and is receiving increasing attention. In this paper, we propose a distributed key management and authentication approach by deploying the recently developed concepts of identity-based cryptography and threshold secret sharing. Without any assumption of prefixed trust relationship between nodes, the ad hoc network works in a self-organizing way to provide the key generation and key management service, which effectively solves the problem of single point of failure in the traditional public key infrastructure (PKI)-supported system. The identity-based cryptography mechanism is applied here not only to provide end-to-end authenticity and confidentiality, but also to save network bandwidth and computational power of wireless nodes.

关键词： Identity management systems Authentication mobile ad hoc networks Identity-based encryption Cryptography Ad hoc networks Computer network management Power system management Public key Bandwidth

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E/sup 2/M: a scalable explicit multicast protocol for MANETs

E/sup 2/M: a scalable explicit multicast protocol for MANETs

引用

IEEE International Conference on Communications (ICC)

作者： H. Gossain C. Cordeiro Kumar Anand D.P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

In this paper, we propose a new scheme for small group multicast in mobile ad hoc networks (MANETs) named extended explicit multicast (E/sup 2/M), which is built on top of Xcast and introduces mechanisms to make it scalable with number of group members for a given multicast session. E/sup 2/M is based on the novel concept of dynamic selection of Xcast forwarder (XF) between a source and its potential destinations. The XF selection is carried out based on group membership and the processing overhead involved in supporting the Xcast procedure at a given node. If the number of members in a given session is small, E/sup 2/M works just like the basic Xcast scheme with no intermediate XFs. As group membership increases, the overhead involved in supporting an Xcast session also increases. Therefore, to reduce the overhead and provide scalability, in E/sup 2/M nodes may dynamically decide to become a XF. This scheme, which can work with few E/sup 2/M aware nodes in the network, provides the transparency of stateless multicast, reduces header processing overhead and makes Xcast scalable with the number of group members.

关键词： Multicast protocols mobile ad hoc networks Routing protocols Scalability Network topology Proposals mobile computing Computer networks distributed computing Wireless networks

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Concurrent Packet Reception Bounds of On-Demand MAC Protocols for Multiple Beam Antennas

Concurrent Packet Reception Bounds of On-Demand MAC Protocol...

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IEEE International Symposium on Personal, Indoor and mobile Radio Communications (PIMRC)

作者： Vivek Jain Dharma P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

Multiple beam antennas can initiate several data communications concurrently by forming spatially separable beams. However, their concurrent packet reception (CPR) capability is largely governed by the underlying medium access control (MAC) protocol. In this paper, we present an analytical framework to calculate CPR upper bounds of multiple beam antennas using on-demand MAC protocols. The model can be used for adaptively changing transmission probability of the nodes so as to achieve optimal performance. We consider both transmitter-initiated and receiver initiated medium access protocols with uniform and random distribution of nodes. Using the developed model, we compute CPR capability of IEEE 802.11 DCF and ESIF based mechanisms for multiple beam antennas. We verify our model using simulations

关键词： Media Access Protocol Directional antennas Access protocols Scheduling Antenna arrays Data communication Upper bound Ad hoc networks Transmitting antennas Transmitters

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A multiple-beam antenna protocol at a wireless access point for exploiting spatial parallelism

A multiple-beam antenna protocol at a wireless access point ...

引用

IEEE Princeton Section Sarnoff Symposium

作者： D. Lal D.P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

We propose a protocol for use at a wireless access point (AP) that uses multiple beam smart antennas. Such APs can be deployed in traffic hotspots to overcome bottlenecks by enhancing capacity significantly. Our protocol is fully compatible with IEEE 802.11 in its current form, and can function with omnidirectional devices. The protocol seeks to exploit parallel packet transmission of downstream data (from the AP to the nodes), while reverting to normal 802.11 for upstream data (from a node to the AP). The performance gain expected from our protocol is proportional to the spatial resolution (number of beams) and the amount of downstream data. Typically, mobile terminals running applications download data from other servers, and hence the volume of downstream data far exceeds the upstream data. In such conditions, our protocol provides substantial gain.

关键词： Wireless application protocol Access protocols mobile antennas Internet Parallel processing mobile computing Directional antennas Timing Media Access Protocol Antennas and propagation

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Supporting MAC layer multicast in IEEE 802.11 based MANETs: issues and solutions

Supporting MAC layer multicast in IEEE 802.11 based MANETs: ...

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Conference on Local Computer Networks (LCN)

作者： H. Gossain N. Nandiraju K. Anand D.P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

In IEEE 802.11 based mobile ad hoc networks (MANET) multicast packets are generally forwarded as one hop broadcast; mainly to reach all the multicast members in the neighborhood in a single transmission. Because of the broadcast property of the forwarding, packets suffer from increased instances of the hidden terminal problem. Mobility of nodes makes things more difficult, and unlike unicast transmissions where MAC can detect the movement of a nexthop by making several retries, it is not possible in case of multicast forwarding. To address these issues, we propose a multicast aware MAC protocol (MMP) for MANET. The basic objective of MMP is to provide a MAC layer support for multicast traffic. This is done by attaching an extended multicast header (EMH) by the multicast agent, which provides the address of the nexthop nodes that are supposed to receive the multicast packet. The MAC layer in MMP uses the EMH field to support an ACK based data delivery. After sending the data packet, the transmitter waits for the ACK from each of its destinations in a strictly sequential order. A retransmission of the multicast packet is performed only if the ACK from any of the nodes in EMH is missing. We compare MMP with IEEE 802.11 and results show that MMP substantially improves the performance of multicast packet delivery in MANET without creating much MAC overhead. In addition, MMP provides a better mechanism to detect the movement of its nexthop members.

关键词： mobile ad hoc networks Broadcasting Multicast protocols Road accidents Media Access Protocol Transmitters Protection Intelligent networks mobile computing Computer networks

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A dynamic slot assignment scheme for slave-to-slave and multicast-like communication in Bluetooth personal area networks

A dynamic slot assignment scheme for slave-to-slave and mult...

引用

GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489)

作者： C. Cordeiro S. Abhyankar D.P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

Bluetooth is a radio technology for wireless personal area networking (WPAN) operating in the 2.4 GHz ISM frequency band. The Bluetooth MAC protocol is based on the master/slave concept wherein any communication between slave devices has to go through the master. While this model provides for simplicity, it incurs longer delay between any two slave devices due to far from optimal packet forwarding, the use of double the bandwidth, and also it wastes additional energy at the master. Moreover, if more than two devices want to communicate as a group, this can only be achieved by either multiple unicast transmissions or a piconet-wide broadcast, clearly resulting in inefficiency. We propose a novel dynamic slot assignment (DSA) scheme whereby the master device dynamically assigns slots to slaves so as to allow them to communicate directly with each other without master intervention. This proposed mechanism also provides for quality of service (QoS) requests, and multi-device conversation by which a multicast-like communication is implemented within a piconet. Through extensive simulation, we observe that this mechanism greatly enhances Bluetooth performance in terms of delay and throughput while incurring extremely low overhead.

关键词： Bluetooth Personal area networks Master-slave Delay Quality of service Frequency Media Access Protocol Bandwidth Unicast Broadcasting

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MDA: an efficient directional MAC scheme for wireless ad hoc networks

MDA: an efficient directional MAC scheme for wireless ad hoc...

引用

GLOBECOM '05. IEEE Global Telecommunications Conference, 2005.

作者： H. Gossain C. Cordeiro D.P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

This paper addresses the issue of deafness and hidden terminal problem in a mobile ad hoc networks (MANETs) using directional antennas. To minimize these effects, we propose a MAC protocol for directional Antennas (MDA) which employs an enhanced directional network allocation vector (NAV) scheme and, a novel technique of diametrically opposite directions (DOD) transmission of RTS and CTS. We compare MDA with IEEE 802.11 and two recently proposed directional MAC protocols and results show that MDA outperforms these protocols in the majority of scenarios investigated. We also point out that the performance does depend on the network topology and the traffic pattern

关键词： Ad hoc networks Directional antennas Media Access Protocol Deafness US Department of Defense mobile ad hoc networks Signal to noise ratio Directive antennas Transmitters mobile computing

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